Setting primary_palette doesn't change color

[Mr Sher]

Hi,

I am playing around kivymd and trying to learn it.

Although I have set self.theme_cls.primary_palette = "Red", the app window is covered with some weird color. No color changes to red.

This is what I get:

Here is the sample code.

from kivy.lang import Builder
from kivymd.app import MDApp
from kivymd.uix.button.button import MDIconButton

colors = {
    "Teal": {
        "200": "#212121",
        "500": "#212121",
        "700": "#212121",
    },
    "Red": {
        "200": "#C25554",
        "500": "#C25554",
        "700": "#C25554",
    },
    "Light": {
        "StatusBar": "E0E0E0",
        "AppBar": "#202020",
        "Background": "#2E3032",
        "CardsDialogs": "#FFFFFF",
        "FlatButtonDown": "#CCCCCC",
    },
}

string = """
BoxLayout:
    id: container
    orientation: "vertical"
    spacing: "10dp"
    padding: "10dp"
   
    ScrollView:
        id: scroll
        MDList:
            id: lst

    MDLabel:
        text: "Material Design Icon Example"
        halign: "center"
        # color: "blue"

    MDIconButton:
        id: icon
        icon: "language-python"
        icon_size: "24dp"
        theme_icon_color: "Custom"
        # icon_color: "blue"
        elevation: 8
        pos_hint: {"center_x": .5, "center_y": .5}
   
    MDIcon:
        icon: "menu"
        # icon_color: "blue"
        pos_hint: {"center_x": .5, "center_y": .5}
        theme_text_color: "Primary"
        size_hint: None, None
        size: "48dp", "48dp"
                    """


class MyKivyApp(MDApp):
    def build(self):
        self.theme_cls.colors = colors
        self.theme_cls.primary_palette = "Red"
        self.theme_cls.theme_style = "Light"
        KV = Builder.load_string(string)
        return KV

    def on_start(self, *args):
        lst = self.root.ids.lst
        for _ in range(0, 20):
            icon_btn = MDIconButton(icon="language-python")
            lst.add_widget(icon_btn)


if __name__ == "__main__":
    MyKivyApp().run()